Honeywell MI DMMI Single Input Monitor Module

KTI07001001MODU

Product Description

The Honeywell Morley-IAS MI-DMMI is an intelligent addressable single-channel monitor module designed to interface and supervise external normally open dry contact initiation circuits on Morley-IAS fire alarm loops.

Make/Brand: Honeywell
Model: MI-DMMI
Operating Voltage: 15 to 30 VDC (minimum 17.5 VDC required for LED operation)
Standby Current: 310 µA at 24 VDC (no communication); 510 µA at 24 VDC (communication every 5s with LED blink)
Loop Isolation: Built-in short circuit isolators on the signalling line circuit
Addressing: Visible rotary decade switches (01 to 99)
Status Indication: Multi-colour LED visible across two planes (normal polling, alarm, and fault)
Wiring: Removable plug-in terminal blocks
Mounting Options: Surface wall box (M200E-SMB / M220E/SMB) or DIN rail clip (M200E-DIN)
Compatibility: Morley-IAS intelligent fire alarm control panels
Compliance: EN 54-17 and EN 54-18

KTI07001001MODU

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Product Details
Available Brands	Honeywell
Unit	Numbers
HSN Code	85311020
Weight	0.1 kg
Dimension	L 9.4 x W 9.3 x H 2.3 cm cm ft in m
Warranty	12 Months Warranty
Tags/categories	Safety Fire Safety Solutions Fire Alarm System Addressable Fire Alarm System

Usually dispatched within 2 days

About this product .

The Honeywell Morley-IAS MI-DMMI is an addressable single input monitor module engineered to integrate conventional normally open dry contact initiating devices into an intelligent fire detection system. The unit continuously supervises the external circuit for normal, open-circuit, and alarm conditions, reporting accurate status directly to the fire alarm control panel.
Equipped with built-in short circuit loop isolation, the MI-DMMI maintains circuit integrity across the signalling line during localized wiring faults. Operating within a supply voltage window of 15 to 30 VDC, it draws a low standby current of 310 µA without communication and 510 µA under standard 5-second polling with LED pulses.
Loop addressing is configured using accessible mechanical rotary decade switches supporting address selections from 01 to 99 without requiring electronic hand-held programmers. The module incorporates plug-in terminal blocks that simplify field termination, commissioning checks, and loop resistance testing.
Diagnostic reporting is supported by an integrated multi-colour LED light pipe visible from both the front face and side profile. The indicator delivers clear visual feedback by pulsing green during panel communication, illuminating steady red on contact activation, and flashing yellow under fault or isolator activation.
The module is suited for monitoring dry contact signals from waterflow switches, sprinkler control valves, security contacts, auxiliary relays, and industrial pressure switches. It can be installed inside an M200E-SMB surface enclosure or snapped onto standard DIN rails using an M200E-DIN mounting clip.
Engineered for commercial and industrial life safety applications, the MI-DMMI complies with EN 54-17 for short-circuit isolators and EN 54-18 for input/output fire alarm devices, operating reliably across temperatures from -20 °C to +60 °C.

Product Information .

Hospitals, Clinics Shopping Malls, Showrooms Government Buildings, Offices Banks Airports Railways, Bus Stations Conference Rooms Auditorium Conference Hall Production Floors Construction Sites

System Compatibility and Loop Integration

Morley-IAS Control Panel and Loop Protocol Compatibility

The Morley-IAS MI-DMMI single-channel monitor module by Honeywell is engineered for direct integration with Morley-IAS intelligent addressable fire alarm control panels. Communicating across standard Morley-IAS loop protocols, the module allows facility engineers to report the status of external third-party initiation hardware directly into the central fire alarm system architecture.

Within the signalling line circuit (SLC) addressing scheme, the MI-DMMI requires a single address out of the ninety-nine available module addresses per loop. System address configuration is conducted directly on the unit using mechanical decade rotary selector switches. This allows technicians to address the module without requiring specialized electronic handheld programmer tools.

Compatible External Contact Devices

The MI-DMMI is configured to provide continuous supervision for a single circuit composed of normally open dry contact initiation equipment. The onboard circuitry actively distinguishes between normal supervisory conditions, open-circuit fault conditions, and active alarm states.

Initiation devices and plant equipment compatible with the MI-DMMI input circuit include:

Waterflow detector switches on wet or dry pipe sprinkler installations
Sprinkler supervisory valve tamper switches
Industrial and mechanical pressure switches
Auxiliary security monitoring contacts
Manual contact units and standard normally open contact interfaces

Signalling Line Circuit (SLC) Electrical Compatibility

The MI-DMMI draws its operating power directly from the Morley-IAS addressable signalling loop. The module operates within an allowable voltage range of 15 to 30 Vdc. A minimum line voltage of 17.5 Vdc is required across the loop terminals to guarantee proper diagnostic LED operation.

For loop current capacity and power supply loading calculations, the MI-DMMI exhibits the following electrical load parameters at 24 Vdc:

Maximum standby current without loop communication: 310 µA at 24 Vdc
Maximum standby current with communication polling every 5 seconds (with LED blink enabled): 510 µA at 24 Vdc

The module includes built-in short circuit isolators located directly on the signalling line circuit, allowing the communication loop to maintain integrity during localized loop faults without requiring auxiliary isolator modules.

Mounting Hardware and Enclosure Compatibility

The physical unit measures 93 mm (H) x 94 mm (W) x 23 mm (D) with a total mass of 100 g. Field installation requires compatible Morley-IAS mounting hardware based on site installation requirements:

Surface wall mounting requires an M200E-SMB or M220E/SMB surface mounting enclosure box.
Standard industrial DIN rail installation requires the M200E-DIN rail mounting clip.

The module features plug-in wiring terminal blocks that simplify field wire termination, pre-commissioning testing, and routine maintenance. When installed in its designated surface box, the decade rotary address switches and the tri-colour LED status indicator (visible in two planes via front and profile light pipes) remain visible and accessible without disassembling the enclosure cover.

Integration and Compatibility Reference

Compatibility Dimension	Hardware / Parameter Specification
Compatible Control Panels	Morley-IAS intelligent addressable fire alarm control panels
Loop Address Consumption	1 address (out of 99 possible module addresses per loop)
Input Circuit Compatibility	Single circuit monitoring normally open dry contact equipment
Signalling Line Operating Voltage	15 to 30 Vdc (minimum 17.5 Vdc for LED function)
Surface Enclosure Options	M200E-SMB / M220E/SMB surface mount box
Rail Mounting Accessory	M200E-DIN mounting clip
Operating Temperature Tolerance	-20 °C to +60 °C
Operating Humidity Range	0% to 95% Relative Humidity (non-condensing)

Regulatory and System Standard Compliance

The MI-DMMI complies with European standards EN 54-17 for integrated short-circuit isolation and EN 54-18 for input/output fire alarm monitoring devices. The module also holds official equipment approvals under CEA GEI 1-084 and GEA GEI 1-082, ensuring standards-compliant implementation across commercial and industrial life safety installations.

Mechanical Mounting, Field Wiring, and Commissioning Guide for Morley-IAS MI-DMMI

Mechanical Mounting Configurations: Surface Box and DIN Rail

The Morley-IAS MI-DMMI by Honeywell features a compact mechanical footprint measuring 93 mm (H) x 94 mm (W) x 23 mm (D) with an overall unit weight of 100 g. The module is engineered for versatile field deployment and supports two primary physical installation methods:

Surface Wall Mounting: The unit can be housed directly inside a dedicated wall mount surface box using either the M200E-SMB or M220E/SMB enclosure. This setup protects electrical terminations while maintaining visual access to indicators.
DIN Rail Mounting: When installing within industrial control enclosures, low-voltage distribution assemblies, or multi-module junction cabinets, the module attaches to standard DIN rails using an M200E-DIN mounting clip.

A central design feature is service accessibility: both the addressing decade rotary switches and the diagnostic indicators remain clearly visible through the mounting enclosure. Commissioning engineers and technicians can inspect unit status or verify loop addressing without dismounting the unit or opening the face cover.

Loop Addressing via Decade Rotary Switches

The MI-DMMI single-channel monitor module operates on the Morley-IAS intelligent fire alarm control panel signalling loop, requiring one dedicated address out of the ninety-nine available module addresses on the loop circuit.

Address setting is completed directly on the hardware via visible decade rotary selector switches. Technicians can adjust the rotary dials to the designated loop address using a standard screwdriver, eliminating the requirement for specialized electronic programming tools, handheld interrogators, or software-based addressing sequences during field installation.

Field Wiring and Electrical Terminations

Field connections are streamlined through plug-in wiring terminal blocks. This pluggable terminal block configuration allows field cabling to be pre-wired, continuity-tested, and serviced without unseating the module chassis from its mounting location.

Signalling Line Circuit (SLC) Voltage: Operates across a 15 to 30 Vdc range. A minimum loop supply of 17.5 Vdc is required to ensure proper LED indicator operation.
Loop Standby Current: Consumes a maximum of 310 µA at 24 Vdc during quiescent standby with no loop communication, and a maximum of 510 µA at 24 Vdc with polling once every 5 seconds and LED blink enabled.
Integrated Short-Circuit Isolators: Built-in line isolators are incorporated directly on the signalling line circuit, fully compliant with EN 54-17 requirements to prevent single loop faults from disabling the entire loop segment.
Monitored Input Circuit: Designed to monitor normally open dry contact initiation devices compliant with EN 54-18, including sprinkler supervisory valves, waterflow switches, pressure switches, and manual contact units. The circuit continuously evaluates normal, open-circuit, and alarm states.

Commissioning, Diagnostics, and Environmental Limits

System operational status is communicated locally via a tri-colour LED indicator visible across two viewing planes (front surface and profile light pipe):

Pulsing Green: Normal interrogation and polling communication from the Morley-IAS fire alarm control panel.
Steady Red: Active alarm initiation condition triggered by the connected field device.
Blinking Yellow: Loop trouble, fault condition, or short-circuit isolator activation.

Install the MI-DMMI exclusively within environments conforming to its operating temperature range of -20 °C to +60 °C and an operating relative humidity limit between 0% and 95% (non-condensing).

Field Diagnostic, Fault Isolation, and Troubleshooting Guide

Tri-Colour LED Diagnostic Status Indications

The Morley-IAS MI-DMMI single-channel monitor module incorporates an integrated tri-colour LED indicator visible across two distinct viewing planes (the front face and the profile light pipe). Field service engineers can view the LED directly through the transparent inspection window of the M200E-SMB (or M220E/SMB) wall mounting box without dismounting or opening the enclosure cover. Diagnostic states include:

Pulsing Green: Confirms normal cyclic polling and successful communication between the module and the Morley-IAS intelligent fire alarm control panel.
Steady Red: Indicates an active alarm condition triggered by the closed state of the supervised external normally open dry contact device.
Blinking Yellow: Indicates a local loop trouble condition, input circuit fault, or activation of the integrated short-circuit isolator.
No LED Activity (Off): Indicates absent signalling line circuit (SLC) power, incorrect line polarity, an unpolled address setting, or loop operating voltage dropping below the 17.5 Vdc threshold required to illuminate the diagnostic LED.

Loop Voltage and Standby Current Verification

When investigating communication failures, missing device reports, or intermittent polling dropouts on the Morley-IAS loop, verify electrical circuit parameters at the plug-in terminal blocks:

Operating Voltage: Measure the DC voltage across the loop input terminals. The functional operating range is 15 to 30 Vdc. If loop voltage drops below 17.5 Vdc due to high loop resistance or excessive line loading, digital communications may continue, but reliable LED illumination will cease.
Standby Current Draw: Without communications, the maximum quiescent draw is 310 µA at 24 Vdc. Under standard interrogation (one communication every 5 seconds with LED blink enabled), current consumption rises to a maximum of 510 µA at 24 Vdc. Higher current measurements typically indicate field wiring leakage, moisture degradation, or partial short circuits on external cabling.

Input Circuit Supervision and Contact Device Faults

The MI-DMMI provides continuous line supervision for normally open dry contact devices, including waterflow switches, sprinkler supervisory valves, pressure switches, and security contacts. The module continuously distinguishes between normal, open circuit, and active alarm states.

If the fire alarm control panel registers an open-circuit fault, check the mechanical seating of the plug-in wiring terminal block and verify cable continuity between the module terminals and the external initiating device. If the panel latches in an unexpected alarm state accompanied by a steady red LED, verify whether the external monitored contact has mechanically jammed closed or if physical wiring damage has bridged the supervisory conductors.

Addressing and Commissioning Faults

The module utilizes visible decade rotary selector switches enabling manual address selection from 01 to 99 across the Morley-IAS signalling loop. Field diagnostic procedures for addressing issues include:

Duplicate Address Trouble: If the control panel reports an address clash or intermittent responses, visually inspect the rotary switch dials through the mounting enclosure window to confirm that the selected decade value is unique on that specific SLC loop.
Unconfigured Address (00): Setting rotary switches to address 00 leaves the unit in an inactive state that will not be polled by the panel. Ensure the tens and units switches are positively indexed to an assigned address between 01 and 99.
Panel Configuration Alignment: Ensure the physical rotary address matches the panel's internal device loop table and software configuration.

Integral Short-Circuit Isolator Activation

The MI-DMMI features built-in short-circuit isolators meeting EN 54-17 standards directly on the signalling line circuit. When a short circuit occurs on an adjacent segment of the SLC wiring, the internal isolator trips to isolate the damaged cable section, presenting a yellow diagnostic indicator. Service personnel should disconnect the plug-in terminal block, measure continuity and line resistance across the isolated loop conductors to clear the short, and confirm that environmental operating conditions remain within the certified range of -20 °C to +60 °C and 0% to 95% relative humidity (non-condensing).

Morley-IAS MI-DMMI Application Scenarios and Integration

The Morley-IAS MI-DMMI by Honeywell is an addressable single-channel monitor module engineered to integrate conventional normally open dry-contact field equipment into an intelligent addressable fire detection loop. Operating across a loop voltage range of 15 to 30 Vdc (requiring at least 17.5 Vdc to maintain LED functionality), the MI-DMMI occupies a single address out of the ninety-nine possible module addresses supported per Morley-IAS signalling line circuit. It continuously supervises field circuits for normal, open-circuit, and alarm states, making it a critical interface component across diverse commercial, industrial, and infrastructure fire safety deployments.

Sprinkler and Waterflow System Monitoring

In wet and dry automatic sprinkler installations, the MI-DMMI supervises mechanical flow and valve state sensors:

Waterflow Alarm Switches: Monitors pipe flow switches to detect water movement caused by sprinkler head activation, immediately transmitting an alarm condition back to the Morley-IAS fire alarm control panel.
Sprinkler Supervisory Tamper Valves: Interfaces with valve supervisory switches to verify that control valves remain fully open, transmitting a supervisory signal if a valve is closed or tampered with.
Pressure Switches: Integrates high- and low-pressure switch contacts installed on dry pipe, pre-action, or booster pump riser assemblies to flag operational anomalies.

Industrial Fire Protection and Plant Interfacing

In manufacturing plants, industrial processing units, and mechanical equipment rooms, the MI-DMMI provides a direct communication bridge between stand-alone plant safety hardware and the central Morley-IAS intelligent network:

Gas Suppression System Discharge Monitoring: Receives contact actuation from discharge pressure switches or release confirmation sensors on clean agent and CO2 extinguishing skids.
HVAC and Smoke Damper Confirmation: Monitors auxiliary end-position dry contacts on fire and smoke dampers to verify physical closure upon system actuation.
Specialized Alarm Equipment Integration: Interfaces conventional manual contact units, thermal link detectors, and auxiliary alarm relays where native addressable communications are not available.

Facility Security and Emergency Exit Contact Supervision

Beyond suppression monitoring, the MI-DMMI connects building perimeter and egress hardware to the fire signaling network. The module interfaces normally open security contacts, monitored panic hardware, and emergency exit release switches. Utilizing its plug-in wiring terminal blocks, installers can connect, commission, and service remote dry-contact circuits without disturbing loop wiring integrity.

Control Enclosure and Remote Field Enclosure Mountings

The MI-DMMI accommodates varied installation topologies via standard mechanical mounting accessories:

DIN Rail Installation in Control Panels: Using the M200E-DIN rail mounting clip, multiple MI-DMMI units can be grouped inside main fire control enclosures, low-voltage MCCs, or intermediate interface cabinets.
Localized Surface Mounting: Installed in field locations utilizing the M200E-SMB or M220E/SMB surface mounting box to sit directly adjacent to monitored valves or switches.

Loop Integrity in Harsh Operating Environments

With an operating temperature envelope spanning -20 °C to +60 °C and humidity resilience up to 95% RH (non-condensing), the module performs dependably in exposed mechanical spaces, riser cupboards, and cold warehouse settings. Built-in short-circuit isolators meeting EN 54-17 protect the Morley-IAS loop from local circuit faults, while visible rotary decade switches and a dual-plane tri-colour LED provide local diagnostic visibility (pulsing green during panel communication, steady red during active alarm, and blinking yellow during trouble or isolator operation) through the enclosure face without unsealing the housing.

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